Steel 90Г29Ю9ВБМ (ДИ38; 90Г29Ю9ВМБФ; ДИ38Ф)

Designation

Name	The value
Designation GOST Cyrillic	90Г29Ю9ВБМ
Designation GOST Latin	90G29Ju9BBM
Transliteration	90G29Yu9VBM
By chemical elements	90Mn29Al9WNbMo

Name	The value
Designation GOST Cyrillic	ДИ38
Designation GOST Latin	DI38
Transliteration	DI38
By chemical elements	CuИ38

Name	The value
Designation GOST Cyrillic	90Г29Ю9ВМБФ
Designation GOST Latin	90G29Ju9BMBF
Transliteration	90G29Yu9VMBF
By chemical elements	90Mn29Al9WMoNbV

Name	The value
Designation GOST Cyrillic	ДИ38Ф
Designation GOST Latin	DI38F
Transliteration	DI38F
By chemical elements	CuИ38V

Description

90Г29Ю9ВБМ steel is used: for the manufacture of forged rods and strips, rolled sections and tubes; parts of aircraft.

Note

Steel corrosion resistant austenitic class with special physical properties.

Standards

Name	Code	Standards
Classification, nomenclature and General rules	В20	OST 1 90005-91
Bars and shapes	В32	TU 14-1-2190-77, TU 14-1-4991-91

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	Al	Mo	Nb	Ca	W	Ce	Mg
TU 14-1-2190-77	0.85-0.95	≤0.02	≤0.02	28-30	≤0.3	≤0.3	≤0.5	Rest	≤0.3	8.3-9.3	0.3-0.5	0.3-0.6	0.05-0.1	0.6-0.9	≤0.05	0.05-0.1

Fe is the basis.
According to TU 14-1-2190-77, the chemical composition is given for steel grade 90Г29Ю9ВМБ-Ш (D38-Ш). The following deviations from the chemical composition are allowed: for aluminum ± 0.15%; for manganese -1.00%; for silicon +0.15%, for phosphorus + 0.005%. Cerium, magnesium and calcium are introduced into the metal by calculation and chemical analysis is not determined.
According to TU 14-1-4991-91, the chemical composition of 90G29YU9VMBF-SH steel (D3838F-III) should comply with Appendix 2, which is sent by the company NPO Temp (or TsNIICHM named after Bardin) upon request. The following deviations from the chemical composition in% are allowed: for manganese - minus 1.0; on aluminum - ± 0,15; for silicon - plus 0,15; on phosphorus - plus 0,005. The content of residual elements in the steel should be: chromium - no more than 0.30%, nickel - no more than 0.50%, copper - no more than 0.30%. Cerium, calcium and magnesium are introduced into the metal from the calculation of the content: cerium - 0.05%, magnesium - 0.05%, calcium - 0.05%. The content of cerium, calcium and magnesium is not determined by chemical analysis.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	830-980	-	-	-	-
-	-	1080-1230	-	-	-	311-341
Bars and strip hot rolled and forged on the other 14-1-4991-91, THE 14-1-2190-77. Quenching in oil or water with 1040-1060 °C + Aging at 540-560 °C (aging 16 h), air cooling (longitudinal samples)
	≥834	≥981	≥25	≥50	≥490	285-331
Bars and strips of wrought iron on the other 14-1-4991-91. Quenching in water from 940-960 °C (for longitudinal samples)
	≥540	≥932	≥50	≥60	≥1770	241-302

Description mechanical marks

Name	Description
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	Limit short-term strength
d₅	Elongation after rupture
y	The relative narrowing
KCU	Toughness
HB	Brinell hardness number